FMFG_NEW_MM_FIELDS_EXTERNAL is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Extension MM item fields US Fed.l external (Screen and BAPI)" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_FMFG_NEW_MM_FIELDS_EXTERNAL TYPE FMFG_NEW_MM_FIELDS_EXTERNAL.
The FMFG_NEW_MM_FIELDS_EXTERNAL table consists of various fields, each holding specific information or linking keys about Extension MM item fields US Fed.l external (Screen and BAPI) data available in SAP. These include FASTPAY (PPA Fast Pay Indicator), PPA_EX_IND (PPA Exclude Indicator), PEROP_BEG (Period of Performance Start), PEROP_END (Period of Performance End)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .